所谓界线类(Borderline)的概念,简言之,就是瘤型(L)与结核样型(T)麻风混合存在于同一个体或同一病灶中的一种特殊形态,或者说是位于L和T两极型之间的一种不稳定状态的麻风。近年来,麻风新发病例有了明显的减少,但诊断为界线类的病例却有所增加。下表是日本的一份统计资料: The so-called borderline concept, in short, is a special form in which neoplasia (L) and tuberculosis-like (T) leprosy exist in the same individual or in the same lesion, or in the L and T poles An unstable state of leprosy between types. In recent years, new cases of leprosy have been significantly reduced, but the diagnosis of borderline cases have increased. The following table is a Japanese statistics: